CN114378345B - Large-chamfer forming surface machining forming milling cutter - Google Patents
Large-chamfer forming surface machining forming milling cutter Download PDFInfo
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- CN114378345B CN114378345B CN202111659934.2A CN202111659934A CN114378345B CN 114378345 B CN114378345 B CN 114378345B CN 202111659934 A CN202111659934 A CN 202111659934A CN 114378345 B CN114378345 B CN 114378345B
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- tooth
- chamfer
- spiral
- milling cutter
- end tooth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
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- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a large-chamfer forming surface machining forming milling cutter which comprises a cutting part and a handle part, wherein the cutting part comprises a plurality of cutting edge groups, each cutting edge group comprises an end tooth, a chamfer tooth and a spiral peripheral tooth, the end tooth is arranged on the end face of the cutting part, the spiral peripheral tooth is arranged on the circumferential surface of the cutting part, the chamfer tooth is connected between the end tooth and the spiral peripheral tooth, the chamfer tooth is provided with a chamfer chip flute, the chamfer chip flute is communicated with the spiral chip flute, the diameter of the cutting part is D, the height of the chamfer tooth is h which is more than or equal to 0.1D, the chamfer tooth is provided with a chamfer tooth front cutter face, and the front angle of the chamfer tooth front cutter face is gamma which is more than or equal to 35 degrees and less than or equal to 60 degrees. According to the invention, the chamfering tooth 4 is made into a large chamfer with the height h more than or equal to 0.1D, and the independent chamfering chip flute 42 is added on the chamfering tooth 4, so that the chamfering tooth has an ultra-large front angle gamma, has the characteristic of light and quick cutting, and can finish the efficient processing of a large chamfering molding surface or a square shoulder surface with a large chamfer at the root and the processing of a thin-wall part at one time.
Description
Technical Field
The invention relates to the field of machining, in particular to a large-chamfer forming surface machining forming milling cutter.
Background
The chamfering molding surface is a surface formed by combining a plane or a curved surface and a chamfer surface, the molding processing belongs to the high-efficiency cutting category, the plane or the curved surface and the chamfer surface can be processed at one time, the smooth connection of the plane or the curved surface and the chamfer surface is realized, the stress concentration is avoided, and the chamfering molding surface is widely applied to mass production.
The common end mill structure comprises spiral grooves and end teeth, the structure can be changed into a chamfer milling cutter, and a chamfer edge is only required to be ground on a cutter tip, when the chamfer height h is less than or equal to 0.05D, the front angle of the small end of the chamfer edge is still larger as the front cutter surface of the chamfer edge is not arranged on the bottom of the spiral grooves, and the chamfer edge is still light and rapid to cut. However, when the height h of the chamfering tooth is more than or equal to 0.1D, the small end of the chamfering blade is positioned in the arc area of the bottom of the spiral groove, the front angle at the small end is a great negative value, and the cutter performance is deteriorated; if the end tooth front cutter surface with a large front angle is adopted to fully cover the chamfer tooth, the front cutter surface of the end tooth reaches the center of the cutter, and the front angle is large, so that the phenomenon of grinding wheel interference can be generated, the rear cutter surface of the end tooth is over-cut, the wedge angles of the chamfer tooth and the end tooth are seriously smaller, and the strength is insufficient.
The chamfer tooth structure of the existing chamfer molding surface forming milling cutter has two types: one is that chamfer tooth and end tooth rake face share a rake face, and the rake face grinds to the cutter center from the cutter external diameter all the way, and the emery wheel sinks degree of depth very big during grinding, because the cutter number of teeth is more (the number of teeth is more than or equal to 5), and when this rake face angle was greater than 20, because emery wheel deflection angle is great, the emery wheel can grind end tooth back knife face a lot, seriously influences cutter tooth intensity. Therefore, the design of the front angle of the cutter with the structure is only smaller than 20 degrees, so that the cutter is not sharp enough and cutting vibration lines are easy to generate.
The other is that the chamfer tooth rake face is a spiral face, and the end tooth rake face does not cover the spiral groove, but is ground from the center to the bottom of the spiral groove. In order to ensure rigidity and cutting sharpness, the core thickness of the milling cutter is large, the spiral angle is larger than or equal to 30 degrees, the circular arc value at the bottom of the spiral groove is large in proportion to the whole groove depth, the front angle is greatly reduced from the starting point to the ending point of the circular arc at the bottom and generally exceeds 20 degrees, while the front angle of the straight line part positioned at the upper part of the spiral groove can be designed to be large, the length of the front angle is small in proportion, and when the chamfering blade is deep, the small end of the front angle enters the circular arc bottom area of the spiral groove, so that the cutting resistance of the whole chamfering blade is large, and cutting vibration lines are easy to generate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the large-chamfer forming surface machining and forming milling cutter which has the characteristics of light and fast cutting and can finish the efficient machining of a large-chamfer forming surface or a square shoulder surface with a large chamfer at the root and the machining of a thin-wall part at one time by adding the independent chamfer chip pocket on the chamfer tooth.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a big chamfer molding surface processing shaping milling cutter, includes cutting portion and stalk portion, the cutting portion includes a plurality of cutting edge group, the cutting edge group includes end tooth, chamfer tooth and spiral week tooth, the terminal surface of cutting portion is located to the end tooth, the circumference face of cutting portion is located to spiral week tooth, the chamfer tooth is connected between end tooth and spiral week tooth, is equipped with a spiral chip groove between two adjacent spiral week teeth, the chamfer tooth has the chamfer chip groove, chamfer chip groove and spiral chip groove intercommunication, the diameter of cutting portion is D, the height of chamfer tooth is h, h is more than or equal to 0.1D, the chamfer tooth has chamfer tooth rake face, the rake angle of chamfer tooth rake face is gamma, and 35 gamma is less than or equal to 60.
As a further improvement of the technical scheme, the chamfer teeth are smoothly connected with the spiral peripheral teeth through circular arc blades.
As a further improvement of the above technical solution, the end tooth has an end tooth rake face, the spiral peripheral tooth has a peripheral tooth rake face, and the chamfer tooth rake face, the end tooth rake face and the peripheral tooth rake face are connected to each other.
As a further improvement of the technical scheme, the chamfer tooth rake face is a plane.
As a further improvement of the above technical solution, the radial rake angle of the start position S of the chamfer tooth is β1, and the radial rake angles β2, β1 and β2 of the end position T are positive values.
As a further improvement of the technical scheme, the end tooth is provided with an end tooth chip flute, and the end tooth chip flute, the chamfer chip flute and the spiral chip flute are communicated and are connected smoothly.
As a further improvement of the technical scheme, the depth of the chamfering chip flute is h1, and the range of h1 is 0.11D-0.13D.
As a further improvement of the technical scheme, the end tooth is provided with an end tooth first rear cutter surface and an end tooth second rear cutter surface, wherein the rear angle of the end tooth first rear cutter surface is delta 1, and the rear angle of the end tooth second rear cutter surface is delta 2, and delta 1 is less than delta 2.
As a further improvement of the technical scheme, the wedge angle of the end teeth is phi, and phi is more than or equal to 60 degrees.
As a further improvement of the technical scheme, the helix angle of the spiral chip groove is beta, and beta is more than or equal to 35 degrees and less than or equal to 60 degrees.
Compared with the prior art, the invention has the advantages that:
according to the large-chamfer forming surface machining forming milling cutter, the chamfer teeth are made into the large chamfer with the height h being more than or equal to 0.1D, and the independent chamfer chip flutes are added on the chamfer teeth, so that the chamfer teeth have the ultra-large front angle gamma, the large-chamfer forming surface machining forming milling cutter has the characteristic of light and quick cutting, can finish the high-efficiency machining of the large-chamfer forming surface or the square shoulder surface with the root being the large chamfer at one time, has no vibration lines and burrs on the machining surface, and is particularly suitable for machining thin-wall parts. Because the diameter of the bottom of the chamfer tooth groove is larger, the sinking depth of the grinding wheel is shallower when the chamfer tooth chip pocket is ground, and the rear cutter surface of the end tooth is not damaged under the condition that the grinding wheel of the chamfer tooth groove must deflect a large angle in order to obtain an oversized rake angle, thereby ensuring that the chamfer tooth has the oversized rake angle and high strength.
Drawings
Fig. 1 is a front view of a large chamfer forming face milling cutter of the present invention.
Fig. 2 is a left side view of the large chamfer forming surface tooling mill of the present invention.
Fig. 3 is an enlarged view of a portion of the chamfer tooth of fig. 1.
Fig. 4 is a schematic view of the structure of the cutting edge group in the present invention.
FIG. 5 is a schematic view of radial rake angles at the beginning and end of a chamfer tooth in accordance with the present invention.
Fig. 6 is a P-P view of fig. 2.
Fig. 7 is a schematic perspective view of an end portion of a cutting portion according to the present invention.
Fig. 8 is a schematic perspective view of another view of the end of the cutting portion of the present invention.
Fig. 9 is a schematic view of the square shoulder surface of a thin-walled workpiece 8 machined using the shaped milling cutter of the present invention.
FIG. 10 is a schematic view of a root chamfer of a square shoulder workpiece machined using the formed milling cutter of the present invention.
The reference numerals in the drawings denote:
1. a handle; 2. a cutting portion; 3. end teeth; 31. end tooth rake face; 32. end tooth chip flutes; 33. the end teeth are provided with a first rear cutter surface; 34. the end tooth second rear cutter surface; 4. chamfering teeth; 41. chamfering the front cutter surface of the tooth; 42. chamfering chip flutes; 5. spiral peripheral teeth; 51. peripheral tooth rake face; 6. a spiral chip groove; 7. arc blades; 8. a thin-walled workpiece; 81. plane, 82, chamfer; 9. square shoulder surface parts; 91. and (5) chamfering the root.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples of the specification.
The large-chamfer forming surface machining forming milling cutter is characterized in that the chamfer value is much larger than the conventional chamfer value, the chamfer tooth height h is more than or equal to 0.1D, and the chamfer height of the conventional chamfer milling cutter is less than 0.05D.
As shown in fig. 1 to 8, the large chamfer forming surface machining forming milling cutter of the present embodiment includes a cutting portion 2 and a shank portion 1, the cutting portion 2 includes a plurality of cutting edge groups, the cutting edge groups include end teeth 3, chamfer teeth 4 and spiral peripheral teeth 5, the end teeth 3 are provided on the end face of the cutting portion 2, the spiral peripheral teeth 5 are provided on the circumferential face of the cutting portion 2, the chamfer teeth 4 are connected between the end teeth 3 and the spiral peripheral teeth 5, a spiral chip groove 6 is provided between two adjacent spiral peripheral teeth 5, the chamfer teeth 4 have chamfer chip grooves 42, the chamfer chip grooves 42 are communicated with the spiral chip grooves 6, the diameter of the cutting portion 2 is D, the height of the chamfer teeth 4 is h, h is equal to or greater than 0.1D, the chamfer teeth 4 have chamfer tooth rake faces 41, the side rake angles of the chamfer tooth rake faces 41 are γ, γ is 35 ° or less than 60 °, and γ is the included angle between the chamfer tooth rake faces 41 and the base plane passing through the cutter axis C.
Six cutting edge groups are provided as examples in this embodiment. The chamfer chip groove 42 is formed by the chamfer tooth rake face 41 and the face a together.
According to the large-chamfer forming surface machining forming milling cutter, the chamfer teeth 4 are made into large chamfers with the height h being more than or equal to 0.1D, and the independent chamfer chip flutes 42 are added on the chamfer teeth 4, so that the chamfer teeth have an oversized side front angle gamma, the large-chamfer forming surface machining forming milling cutter has the characteristic of light and quick cutting, can finish the efficient machining of the large-chamfer forming surface or the square shoulder surface with the root being the large chamfer at one time, has no vibration lines and burrs on the machining surface, and is particularly suitable for machining of thin-wall parts. Because the diameter of the chamfer tooth groove bottom is larger, the sinking depth of the grinding wheel is shallower when the chamfer tooth chip pocket is ground, and the rear cutter surface of the end tooth 3 is not damaged under the condition that the grinding wheel of the chamfer groove has to deflect a large angle in order to obtain an oversized rake angle, thereby ensuring that the chamfer tooth 4 has the oversized rake angle and high strength. The chamfer tooth rake face 41 of the present embodiment has a side rake angle γ of greater than 35 ° which is an oversized rake angle, whereas the conventional rake angle is 30 ° or less.
In this embodiment, chamfer tooth 4 is connected with spiral peripheral tooth 5 through circular arc sword 7 is smooth, and circular arc sword 7's setting can process out finished piece fillet root well, plays well elimination stress concentration effect.
In the present embodiment, the end tooth 3 has an end tooth rake face 31, the spiral peripheral tooth 5 has a peripheral tooth rake face 51, and the chamfer tooth rake face 41, the end tooth rake face 31, and the peripheral tooth rake face 51 are connected to each other. The end teeth 3, the chamfer teeth 4, the circular arc blade 7 and the spiral peripheral teeth 5 are sequentially and smoothly connected to form a forming blade.
In this embodiment, the chamfer tooth rake face 41 is a plane, and the chamfer tooth rake face 41 is a plane with a large rake angle, and is very sharp. Because the chamfer tooth rake face 41 is a plane, the radial rake angle of the starting position S of the chamfer tooth 4 is beta 1, the radial rake angles beta 2, beta 1 and beta 2 of the ending position T are positive values, meanwhile, a larger chip removal space is provided, the depth of the chamfer chip flute 42 is h1, the range of h1 is 0.11D-0.13D, the root diameter of the chamfer chip flute 42 is larger, the end tooth 3 cannot be damaged during grinding, the wedge angle psi of the end tooth 3 is larger than or equal to 60 degrees, the strength of the end tooth 3 is greatly ensured, the strength of the chamfer tooth 4 is supported, the whole forming edge with high strength and light cutting speed is formed, and the cutter strength is ensured.
In this embodiment, the end tooth 3 has an end tooth chip flute 32, and the end tooth chip flute 32, the chamfer chip flute 42 and the spiral chip flute 6 are communicated and connected smoothly. The helix angle of the spiral chip groove 6 is beta, and beta is more than or equal to 35 degrees and less than or equal to 60 degrees.
In this embodiment, the end tooth 3 has an end tooth first flank 33 and an end tooth second flank 34, the relief angle of the end tooth first flank 33 is δ1, and the relief angle of the end tooth second flank 34 is δ2, δ1 < δ2. Two rear cutter surfaces with different rear angles are arranged, and the rear cutter surfaces are used for increasing the chip containing space of the end tooth 3 and reducing the grinding allowance (small rear angle and small grinding allowance) of the first rear cutter surface on the premise of ensuring the strength of the end tooth 3, so that the first rear cutter surface is beneficial to accurate grinding. In this embodiment δ1=7° ±3°, δ2=18° ±3°, the end tooth first flank 33 has a width b of b=0.08d±0.15, and the end tooth 3 has a rake angle λ, λ=5° ±4°.
Fig. 9 is a schematic view of a square shoulder surface on a thin-walled workpiece 8 machined by a large chamfer forming surface machining and shaping milling cutter according to the present invention, and a machined part is composed of a plane 81 and a chamfer 82.
Fig. 10 is a schematic view of a square shoulder surface workpiece 9 with a large chamfer angle surface at the root by using the large chamfer angle molding surface machining milling cutter of the invention, and 91 is a root chamfer angle.
In addition to the present embodiment, the number of the cutting edge groups may be four, five, or more than six in other embodiments.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (10)
1. A large chamfer forming surface machining forming milling cutter is characterized in that: including cutting portion (2) and stalk portion (1), cutting portion (2) include a plurality of cutting edge group, cutting edge group includes end tooth (3), chamfer tooth (4) and spiral week tooth (5), the terminal surface of cutting portion (2) is located to end tooth (3), the circumference of cutting portion (2) is located to spiral week tooth (5), chamfer tooth (4) connect between end tooth (3) and spiral week tooth (5), are equipped with one spiral chip groove (6) between two adjacent spiral week teeth (5), chamfer tooth (4) have chamfer chip groove (42), chamfer chip groove (42) and spiral chip groove (6) intercommunication, the diameter of cutting portion (2) is D, the height of chamfer tooth (4) is h, h is greater than or equal to 0.1D, chamfer tooth (4) have chamfer tooth rake face (41), the side rake angle of chamfer tooth rake face (41) is gamma, 35 is less than or equal to 60.
2. The large chamfer forming face machine milling cutter of claim 1, wherein: the chamfering teeth (4) are connected with the spiral peripheral teeth (5) in a smooth manner through circular arc blades (7).
3. The large chamfer forming face machine milling cutter of claim 1, wherein: the end tooth (3) is provided with an end tooth rake face (31), the spiral peripheral tooth (5) is provided with a peripheral tooth rake face (51), and the chamfer tooth rake face (41), the end tooth rake face (31) and the peripheral tooth rake face (51) are mutually connected.
4. The large chamfer forming face machine milling cutter of claim 1, wherein: the chamfer tooth rake face (41) is a plane.
5. The large chamfer forming face machine tooling milling cutter of claim 4, wherein: the radial rake angle of the starting position S of the chamfer tooth (4) is beta 1, and the radial rake angles beta 2, beta 1 and beta 2 of the ending position T are positive values.
6. The large chamfer forming face machine tooling milling cutter according to any one of claims 1 to 4, wherein: the end tooth (3) is provided with an end tooth chip flute (32), and the end tooth chip flute (32), the chamfer chip flute (42) and the spiral chip flute (6) are communicated and are connected smoothly.
7. The large chamfer forming face machine tooling milling cutter according to any one of claims 1 to 4, wherein: the depth of the chamfering chip flute (42) is h1, and the range of h1 is 0.11D-0.13D.
8. The large chamfer forming face machine tooling milling cutter according to any one of claims 1 to 4, wherein: the end tooth (3) is provided with an end tooth first rear cutter surface (33) and an end tooth second rear cutter surface (34), the rear angle of the end tooth first rear cutter surface (33) is delta 1, and the rear angle of the end tooth second rear cutter surface (34) is delta 2, wherein delta 1 is less than delta 2.
9. The large chamfer forming face machine tooling milling cutter according to any one of claims 1 to 4, wherein: the wedge angle of the end teeth (3) is phi, and phi is more than or equal to 60 degrees.
10. The large chamfer forming face machine tooling milling cutter according to any one of claims 1 to 4, wherein: the helix angle of the spiral chip groove (6) is beta, and beta is more than or equal to 35 degrees and less than or equal to 60 degrees.
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